.addafter:after
{ 
content:"hello";
background-color:yellow;
color:red;
font-weight:bold;
}

/*清除浮动*/
.clearfix:after {
    clear: both;
    content: " ";
    display: block;
    height: 0;
    visibility: hidden;
}

.left {
	float:left;
}

/*切换选项卡*/
.nav {
    border-bottom: 1px solid #e6e6e6;
    color: #e6e6e6;
    height: 41px;
	line-height: 41px;
    text-align: center;
}

.nav li a {
    background: none repeat scroll 0 0 #f0f0f0;
    border-right: 1px solid #e6e6e6;
    color: #787878;
    display: block;
    font-size: 14px;
    width: 100px;
}


.nav a:active {
    background: repeat-x scroll 0 0 rgba(255, 255, 255,0);
    height: 41px;
    position: relative;
    z-index: 2;
}

a {
    color: #fff;
    text-decoration: none;
}



ul {
    margin: 0;
    padding: 0;
}

li { float: left;}
ol, ul, li {
    list-style: outside none none;
}

